[Module-build-general] document do_system?

[Dave R. <au...@ur...>]

Here's some docs:

=item do_system($cmd, @args)

Given a command and an array of optional arguments, this method will print
the command to C<STDOUT>, and then execute it using Perl's C<system()>
built-in.  It returns true or false to indicate success or failure, which
is the opposite of how Perl's built-in command works.



-dave

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